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sprawność : 37 phrases in 9 subjects |
| Accumulators | 2 |
| Antennas and waveguides | 7 |
| Automatic control | 1 |
| Electric traction | 2 |
| Electricity generation | 2 |
| Lighting other than cinema | 16 |
| Telecommunications | 1 |
| Thermal Energy | 3 |
| Vacuum tubes | 3 |
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